Question

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as if 可以引导 表语从句和 状语从句
那么请问 as if 可不可以引导宾语从句？？ 譬如：
So, why did the ancient Greeks believe that the Earth was the center of the universe? Well, it made sense to them. Observations of the sky make it appear as if the Sun, the moon, and the stars all revolve around the Earth everyday, while the Earth itself stayed in one place.

这里的 it 代替的是 as if 引导的宾语从句么？？

Answer 1

答：你很会动脑！这个问题这么提出来，似乎很有道理。
其实问题可以简化。
先看一个比较简单而常见的句型：
It seems that what you say is reasonable.
这是一个句型。it是形式主语，真正的主语是that从句。that-引导的是名词性从句。
而It appears as if the Sun revolves around the Earth every day. 中的it不是形式主语，而是指“情况、天象，人们观察到的那个景象。”，一如：She appears as if she is only 30 years old. 她的外表看上去好象只有30岁。
所以：
Observations of the sky make it appear （to humans) as if the Sun, the moon, and the stars all revolve around the Earth every day, while the Earth itself stayed in one place.
译：对天空的观察，使人感觉好象每天太阳、月亮以及星星全都围绕着地球转，而地球本身却是呆在原地不动似的。
appear是系动词，后面的as if 从句是表语从句。

Answer 2

as if 不可引导宾语从句，这里的 it 代替的是 as if 引导的表语从句， it前省略了宾语从句引导词that。
make sense: 有意义;意思清楚;有道理。make sense of :理解;懂;明白,搞清…的意思。make sense to sb　对某人有意义、好处。如：
It would make sense to leave early. 还是早点走好。
That doesn't make sense to me. 对我毫无意思。

全句：那么，为什么古希腊人认为地球是宇宙的中心呢？哦，这对他们来说意义很大。对天空的观察认为好像太阳，月亮和星星每天都围绕地球转动，而地球本身停留在一个地方不动。

Answer 3

第一个it是指the belief of th ancient Greeks. 第二个it不是指as if引导的宾语从句，而应该是指the sky也可以说是指the universe.

Answer 4

as if可以引导名词性从句，句中不担任成分。常见有appear/feel as if